Influence of spraying distance of ceramic soft wire flame spraying on properties of layer

By using the soft wire flame spraying equipment and Al₂O₃-3% TiO₂ ceramic soft wire,the spraying processing and properties of coatings were investigated.The result shows that the strength and density of coating was improved clearly by appending a bit of TiO₂。By the analysis of X-ray diffraction,the coating is mainly made of α-Al₂O₃ and γ-Al₂O₃.α-Al₂O₃ is the main phase in the coating,which makes the favorable property in the coating.Under the condition of working pressure C₂H₂(0.135 MPa) and O₂(0.3 MPa),and gas flux of 65 L/min and 62 L/min,and spread distance of 80mm,the combination strength can reach as high as 22 MPa,and the hardness can reach to 1200 HV.At the same time,the cavity ratio can decrease to 4%.